James harry keighly mccollum



N0. 62|,84|. Patented Mar. 28, |899. J. H. K. MCCOLLUM.

AIR VALVE.

(Application leq Apr. 7, 1898.)

(No Model.)

UNITED STM/TT'ESN PATENT ErrcE.

JAMES HARRY KEIGHLY MCOOLLUM, OF TORONTO, CANADA.

AIR-VALVE.Y

SPECIFICATION forming part of Letters Patent No. 621,841, dated March 28, 1899. Application filed April`7, 1898. Serial ll'o. 676,793. (No model.)

T0 a/ZZ whom, t may concern,.-

Beit known that I, JAMEs HARRY KEIGHLY MCOOLLUM, electrician, of the city of Toronto, in the county of York, in the Province of Ontario, Canada, have invented certain new and useful Improvements in Air-Valves, of which the following is a specification. My invention relates to improvements in air-valves; and the object of the invention is to devise a valve particularly adaptable for bicycles, which will be always absolutely airtight except during the period that the airis being pumped through it and be so air-tight quite independently of the usual cap; and it consists, essentially, of a valve comprising a suitable hollow casing with enlarged upper end, the lower end of the casing being provided with a tubular elastical covering, preferably of rubber, and the interior being provided with a hollow stem, with ahead screwed into the threaded upper interior portion of the casing and an inclosing cap provided with a s uitable washer for closing the upper end of the stem and a screw-nut having'a central hole which fits over a stem on the end of the closing-cap, such cap being of less diameter than the portions of the hollow casing in which it fits and the screw-cap of the stem and screw-nut being provided with'side' notches arranged as hereinafter more particularly explained.

Figure l is a sectional perspective view of a valve constructed in accordance with my invention, showing it completely closed. Fig. 2 is a similar view showing the outer cap removed and the inner cap raised to permit of deflation of the tire or other air-space. Fig. 3 is a perspective view of the stem. Fig. 4 is a perspective View of the outer cap. Fig. 5 is a perspective view of the inner cap and screw-nut connected thereto.

In the drawings like letters of reference indicate corresponding parts in each figure.

A is the casing, which consists of the enlarged upper portion A', internally threaded at a, and the reduced lower portion A2, which is provided with atubular covering B, of rubber or other suitable elastic material, which is suitably fastened to the outside of the portion A2 by thread or other suitable fastening, so as to make an air-tight connection between D is a hollow stem provided with a head D', having a screw-thread d and side notches d. The stem D when screwed down to its seat, as indicated in the drawings, projects below the bottom of t-he portion A2, and as the stem is of less diameter than the interior hole a a clear annular passage-way is provided froin the upper threaded portion of the valve down to where the tube B presses upon the stem.. The notches d permit of the passage of the air to the hole a around the stem while the tire is being inflated, the unconined narrowed portion of the tube B yielding to permit the entrance of air, but preventing its escape.

It will be noticed that the head D has a reduced upper end d2 of substantially the same diameter as the major portion of the stem.

E is a cap provided with a lower circular recess e, having located therein a circular washer e. The cap E is provided with an upwardlyextending stem e2, which extends through a screw-nut F. These portions are securely, though loosely, held together, the

upper end of the stem e2 being pinched at f in its manufacture, so as to press it and enlarge it after such stem has been inserted into the hole c3 of the nut, and thereby serves to retain the nut and cap together; A cross-` notch f extends across the top of the nut F.

G is the outer cap, which is provided with a knurled enlarged central portion G,thread ed lower end G2, and cylindrical upper end G3, provided with projections g g.

Having now described the principal parts involved in my invention, I shall briefly describe the utility of my valve.

In the position in which the valve is shown inFig. l it will be noticed that the washer e of the cap E rests upon the top cl2 of the valve-stem D. It will therefore be seen that if the cap G is removed the stem will be still air-tight, the central hollow stem being closed and the rubber tube hugging closely the lower end of the stem D. Consequently it does not matter in my valve whether the cap G is re- IOO moved or not; but in order to keep the dirt out it will be preferably used, as well as for the other purpose, which I shall now describe.

In order to deliate the valve-stem, the cap G when removed may be turned upside down and the projectionsg inserted into the notch f on each side of the stem c2 of the cap E. By now turning the screw-nut F the cap E may be raised in to the position shown in Fig. 2. By so raising the cap there will be no rotary motion communicated to it, at least until it is entirely olf its seat. It will thus be seen that there will be no tendency for the washer c', which is preferably of rubber, to become worn out, as would otherwise be the case if the cap E and nut F were integral. In lowering the cap E down into the position shown in Fig. l it will also be noticed that the washer c' will also be brought into direct contact with the top d2 of the hollow stem D, and this, too, without turning the cap or deleteriously affecting the washer. In the position in which the cap E is shown in Fig. 2 it will be clearly understood that the tire will be readily deflated.

As it is of course very seldom necessary to deflate the tire, the stem D will be very seldom disturbed.

It will be noticed that I preferably reduce the diameter of the lower end of the stem and provide substantially V-shaped annular rings, which I nd in practice eitectually prevents any retrocession of the air.

lVhat I claim as my invention isl. An air-valve comprising,T the Casin g having an enlarged upper end internally threaded, the stem iitting therein and extending below the bottom of the casing, so as to leave a passage-way around it into the upper portion of the casing, the elastical tube fitting the lower portion of the casing and hugging the bottom of the hollow stem, a suitable head attached to the top of the hollow stem provided with apertures and means for closing the top of the hollow stem as and for the purpose specilied.

An air-valve comprising the casing having an enlarged upper end internally threaded, the stem itting therein and extending below the bottom of the casing, so as to leavea passage-way around it into the upper portionI of the casing, the elastical tube fitting the lower portion of the casing and hugging the bottom of the hollow stem, a suitable head attached to the top of the hollow stem provided with apertures and an exterior thread on the head for securing it in position and a cap of less diameter than the interior of the casing provided with a circular bottom recess and washer therein and a screw connection to the thread ofthe hollow Casin g and means for vertically adjusting the cap to and from the top of the hollow stem and suitable apertures in the cap circumferentially outside the washer as and for the purpose specified.

3. In an air-valve, in combination the casing having an enlarged upper end internally threaded, the stem fitting therein and extending below the bottom of the casing, so as to leave a passage-way around it into the upper portion of the casing, the elastical tube iitting the lower portion of the casing and hugging the bottom of the hollow stem, a suitable head attached to the top of the hollow stem pro vided with apertures and an exterior thread on the head for securing it in position, a cap of less diameter than the interior of the casing provided with a circular bottom recess and washer therein and an upwardly-extending stem having an enlarged upper end, a screw nut having a vcentral hole through which such stem extends and by which the cap and n ut are connected together and side notches in the nut as and for the purpose specitied.

4. In an air-valve, in combination the casing having an enlarged upper end internally threaded, the stem fitting therein and extending below the bottom of the casing, so as to leave a passage-Way around it into the upper portion of the casing, the elastical tube .fitting the lower portion of the casing and hugging the bottom of the hollow stem, a suitable head attached to the top of the hollow stem provided with apertures and an exterior thread on the head for securing it in position, a cap of less diameter than the interior of the casing provided with a circular bottom recess and washer therein and' a screw connection to the thread of the hollow casing, means for vertically adjusting the cap to and from the top of the hollow stem and suitable apertures in the cap circumferentially outside the washers, a cross-notch at the top of the cap and the outer cap provided with a correspondingly-shaped projection to it into the crossnotch of the cap as and for the purpose specilied.

5. In an air-valve, in combination the casing having an enlarged upper end internally threaded, the stem iitting therein and extending below the bottom of the casing, so as t0 leave a passage-way around itinto the upper portion of the casing, the elastical tube {itting the lower portion of the casing and hugging the bottom of t-he hollow stem, a suitable head attached to the top of the hollow stem provided with apertures and an exterior thread on the head for securin g it in position, a cap of less diameter than the interior ofthe casing provid ed with a circular bottom recess and washer therein, an upwardly-extending stem having an enlarged upper end, a screwnut having a central hole through which such stem extends and by which the cap and nut are connected together and side notches in the nut, a cross-notch in the nut and the outer cap provided with projections designed to lit into the notch on each side of the ccntral stem of the cap as and for the purpose specilied.

G. An air-valve comprising the casing, the

IOO

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stein iitting therein and extending below the on the bottom of the hollow stein and means bottoln of the easing, so as to leave a pasfor closing the top of such stem as and for sage-Way around -it into the Lipper portion of the purpose specified..

the easing and having the annular projee- JAMES HARRY KEIGIILY MCCOLLUM. 5 tions on the lower portion of the stein, the fitnessesz elastioal tube fitting the lower portion of the B. BOYD,

casing and hugging the annular projections `A. H. MCADAMS. 

